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If you have dinner in upscale hotel dining rooms in Vietnam, you can wear as you do in upscale hotel in other countries
For your attire in sightseeing day, you can wear slacks, shorts, or skirt.. any which make you feel comfortable.Just notice that, if you visit pagodas or the Ho Chi Minh Maosoleum(in Hanoi), you should not wear shorts or skirts. You should dress formally.

In March, the weather in Hanoi is still cool. In other provinces, it is not so hot, donot worry. March is very nice time for visiting Vietnam.

We 've been traveling around VN for about three weeks. We are in Hue right now and it was 95 degrees, yesterday it was close to 90. We r heading south and I have been following the weather and the forecast is 90's. So for me it has been hot in the central portion and I imagine also in Saigon and thereabouts. It was cool in the north.

Have not seen any shorts, but lots of Capri length pants.
The other night we ate at LaResidence in Hue, a very upscale hotel restaurant. Most women were dressed very casually with cotton slacks and various types of tee shirts. I saw one women in a dress.